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下面的计算哪些是正确的?正确的画“√”,错误的画“×”.(1)54+35+46=100+35(2)45×32=45×2×16(3)514-78+22=514-(78+22)(4)102×29=100×29+2(5)99×24=100×24-1(6)
题目详情
| 下面的计算哪些是正确的?正确的画“√”,错误的画“×”. (1)54+35+46=100+35______ (2)45×32=45×2×16______ (3)514-78+22=514-(78+22)______ (4)102×29=100×29+2______ (5)99×24=100×24-1______ (6)34×101-1=34×100______. |
(1)54+35+46=100+35______
(2)45×32=45×2×16______
(3)514-78+22=514-(78+22)______
(4)102×29=100×29+2______
(5)99×24=100×24-1______
(6)34×101-1=34×100______.
(1)54+35+46=100+35______
(2)45×32=45×2×16______
(3)514-78+22=514-(78+22)______
(4)102×29=100×29+2______
(5)99×24=100×24-1______
(6)34×101-1=34×100______.
(1)54+35+46=100+35______
(2)45×32=45×2×16______
(3)514-78+22=514-(78+22)______
(4)102×29=100×29+2______
(5)99×24=100×24-1______
(6)34×101-1=34×100______.
(1)54+35+46=100+35______
(2)45×32=45×2×16______
(3)514-78+22=514-(78+22)______
(4)102×29=100×29+2______
(5)99×24=100×24-1______
(6)34×101-1=34×100______.
▼优质解答
答案和解析
(1)54+35+46,
=(54+46)+35,
=100+35,
=135;
100+35=135;
计算结果相同,计算正确.
(2)45×32=1440;
45×2×16,
=90×16,
=1440;
计算结果相同,计算正确;
(3)514-78+22,
=436+22,
=458;
514-(78+22),
=514-100,
=414;
458≠414,计算结果不相等,计算错误.
(4)102×29=2958;
100×29+2,
=2900+2,
=2902;
2958≠2902,计算结果不相等,计算错误.
(5)99×24,
=(100-1)×24,
=100×24-1×24,
=2400-24,
=2376;
100×24-1,
=2400-1,
=2399;
2376≠2399,计算结果不相等,计算错误.
(6)34×101-1,
=3434-1,
=3433;
34×100=3400.
3433≠3400,计算结果不相等,计算错误.
故答案为:√,√,×,×,×,×. (1)54+35+46,
=(54+46)+35,
=100+35,
=135;
100+35=135;
计算结果相同,计算正确.
(2)45×32=1440;
45×2×16,
=90×16,
=1440;
计算结果相同,计算正确;
(3)514-78+22,
=436+22,
=458;
514-(78+22),
=514-100,
=414;
458≠414,计算结果不相等,计算错误.
(4)102×29=2958;
100×29+2,
=2900+2,
=2902;
2958≠2902,计算结果不相等,计算错误.
(5)99×24,
=(100-1)×24,
=100×24-1×24,
=2400-24,
=2376;
100×24-1,
=2400-1,
=2399;
2376≠2399,计算结果不相等,计算错误.
(6)34×101-1,
=3434-1,
=3433;
34×100=3400.
3433≠3400,计算结果不相等,计算错误.
故答案为:√,√,×,×,×,×. (1)54+35+46,
=(54+46)+35,
=100+35,
=135;
100+35=135;
计算结果相同,计算正确.
(2)45×32=1440;
45×2×16,
=90×16,
=1440;
计算结果相同,计算正确;
(3)514-78+22,
=436+22,
=458;
514-(78+22),
=514-100,
=414;
458≠414,计算结果不相等,计算错误.
(4)102×29=2958;
100×29+2,
=2900+2,
=2902;
2958≠2902,计算结果不相等,计算错误.
(5)99×24,
=(100-1)×24,
=100×24-1×24,
=2400-24,
=2376;
100×24-1,
=2400-1,
=2399;
2376≠2399,计算结果不相等,计算错误.
(6)34×101-1,
=3434-1,
=3433;
34×100=3400.
3433≠3400,计算结果不相等,计算错误.
故答案为:√,√,×,×,×,×. (1)54+35+46,
=(54+46)+35,
=100+35,
=135;
100+35=135;
计算结果相同,计算正确.
(2)45×32=1440;
45×2×16,
=90×16,
=1440;
计算结果相同,计算正确;
(3)514-78+22,
=436+22,
=458;
514-(78+22),
=514-100,
=414;
458≠414,计算结果不相等,计算错误.
(4)102×29=2958;
100×29+2,
=2900+2,
=2902;
2958≠2902,计算结果不相等,计算错误.
(5)99×24,
=(100-1)×24,
=100×24-1×24,
=2400-24,
=2376;
100×24-1,
=2400-1,
=2399;
2376≠2399,计算结果不相等,计算错误.
(6)34×101-1,
=3434-1,
=3433;
34×100=3400.
3433≠3400,计算结果不相等,计算错误.
故答案为:√,√,×,×,×,×.
| (1)54+35+46, =(54+46)+35, =100+35, =135; 100+35=135; 计算结果相同,计算正确. (2)45×32=1440; 45×2×16, =90×16, =1440; 计算结果相同,计算正确; (3)514-78+22, =436+22, =458; 514-(78+22), =514-100, =414; 458≠414,计算结果不相等,计算错误. (4)102×29=2958; 100×29+2, =2900+2, =2902; 2958≠2902,计算结果不相等,计算错误. (5)99×24, =(100-1)×24, =100×24-1×24, =2400-24, =2376; 100×24-1, =2400-1, =2399; 2376≠2399,计算结果不相等,计算错误. (6)34×101-1, =3434-1, =3433; 34×100=3400. 3433≠3400,计算结果不相等,计算错误. 故答案为:√,√,×,×,×,×. |
=(54+46)+35,
=100+35,
=135;
100+35=135;
计算结果相同,计算正确.
(2)45×32=1440;
45×2×16,
=90×16,
=1440;
计算结果相同,计算正确;
(3)514-78+22,
=436+22,
=458;
514-(78+22),
=514-100,
=414;
458≠414,计算结果不相等,计算错误.
(4)102×29=2958;
100×29+2,
=2900+2,
=2902;
2958≠2902,计算结果不相等,计算错误.
(5)99×24,
=(100-1)×24,
=100×24-1×24,
=2400-24,
=2376;
100×24-1,
=2400-1,
=2399;
2376≠2399,计算结果不相等,计算错误.
(6)34×101-1,
=3434-1,
=3433;
34×100=3400.
3433≠3400,计算结果不相等,计算错误.
故答案为:√,√,×,×,×,×.
=(54+46)+35,
=100+35,
=135;
100+35=135;
计算结果相同,计算正确.
(2)45×32=1440;
45×2×16,
=90×16,
=1440;
计算结果相同,计算正确;
(3)514-78+22,
=436+22,
=458;
514-(78+22),
=514-100,
=414;
458≠414,计算结果不相等,计算错误.
(4)102×29=2958;
100×29+2,
=2900+2,
=2902;
2958≠2902,计算结果不相等,计算错误.
(5)99×24,
=(100-1)×24,
=100×24-1×24,
=2400-24,
=2376;
100×24-1,
=2400-1,
=2399;
2376≠2399,计算结果不相等,计算错误.
(6)34×101-1,
=3434-1,
=3433;
34×100=3400.
3433≠3400,计算结果不相等,计算错误.
故答案为:√,√,×,×,×,×.
=(54+46)+35,
=100+35,
=135;
100+35=135;
计算结果相同,计算正确.
(2)45×32=1440;
45×2×16,
=90×16,
=1440;
计算结果相同,计算正确;
(3)514-78+22,
=436+22,
=458;
514-(78+22),
=514-100,
=414;
458≠414,计算结果不相等,计算错误.
(4)102×29=2958;
100×29+2,
=2900+2,
=2902;
2958≠2902,计算结果不相等,计算错误.
(5)99×24,
=(100-1)×24,
=100×24-1×24,
=2400-24,
=2376;
100×24-1,
=2400-1,
=2399;
2376≠2399,计算结果不相等,计算错误.
(6)34×101-1,
=3434-1,
=3433;
34×100=3400.
3433≠3400,计算结果不相等,计算错误.
故答案为:√,√,×,×,×,×.
=(54+46)+35,
=100+35,
=135;
100+35=135;
计算结果相同,计算正确.
(2)45×32=1440;
45×2×16,
=90×16,
=1440;
计算结果相同,计算正确;
(3)514-78+22,
=436+22,
=458;
514-(78+22),
=514-100,
=414;
458≠414,计算结果不相等,计算错误.
(4)102×29=2958;
100×29+2,
=2900+2,
=2902;
2958≠2902,计算结果不相等,计算错误.
(5)99×24,
=(100-1)×24,
=100×24-1×24,
=2400-24,
=2376;
100×24-1,
=2400-1,
=2399;
2376≠2399,计算结果不相等,计算错误.
(6)34×101-1,
=3434-1,
=3433;
34×100=3400.
3433≠3400,计算结果不相等,计算错误.
故答案为:√,√,×,×,×,×.
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