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简便运算:0.9999×0.7+0.1111×2.7;36×1.09+1.2×67.3;48×1.08+1.2×56.8;335×2525+37.9×625;6.8×16.8+19.3×3.2;81.5×15.8+81.5×51.8+67.6×18.5.
题目详情
简便运算:
0.9999×0.7+0.1111×2.7;
36×1.09+1.2×67.3;
48×1.08+1.2×56.8;
3
×25
+37.9×6
;
6.8×16.8+19.3×3.2;
81.5×15.8+81.5×51.8+67.6×18.5.
0.9999×0.7+0.1111×2.7;
36×1.09+1.2×67.3;
48×1.08+1.2×56.8;
3
3 |
5 |
2 |
5 |
2 |
5 |
6.8×16.8+19.3×3.2;
81.5×15.8+81.5×51.8+67.6×18.5.
▼优质解答
答案和解析
①0.9999×0.7+0.1111×2.7
=0.1111×9×0.7+0.1111×2.7
=0.1111×6.3+0.1111×2.7
=0.1111×(6.3+2.7)
=0.1111×9
=0.9999
②36×1.09+1.2×67.3
=1.2×30×1.09+1.2×67.3
=1.2×32.7+1.2×67.3
=1.2×(32.7+67.3)
=1.2×100
=120
③48×1.08+1.2×56.8
=1.2×40×1.08+1.2×56.8
=1.2×43.2+1.2×56.8
=1.2×(43.2+56.8)
=1.2×100
=120
④3
×25
+37.9×6
=3.6×25.4+37.9×6.4
=25.4×(3.6+6.4)+12.5×6.4
=25.4×10+12.5×8×0.8
=254+100×0.8
=254+80
=334
⑤6.8×16.8+19.3×3.2
=16.8×(6.8+3.2)+2.5×3.2
=16.8×10+2.5×4×0.8
=168+10×0.8
=168+8
=176
⑥81.5×15.8+81.5×51.8+67.6×18.5
=81.5×(15.8+51.8)+67.6×18.5
=81.5×67.6+67.6×18.5
=67.6×(81.5+18.5)
=67.6×100
=6760
=0.1111×9×0.7+0.1111×2.7
=0.1111×6.3+0.1111×2.7
=0.1111×(6.3+2.7)
=0.1111×9
=0.9999
②36×1.09+1.2×67.3
=1.2×30×1.09+1.2×67.3
=1.2×32.7+1.2×67.3
=1.2×(32.7+67.3)
=1.2×100
=120
③48×1.08+1.2×56.8
=1.2×40×1.08+1.2×56.8
=1.2×43.2+1.2×56.8
=1.2×(43.2+56.8)
=1.2×100
=120
④3
3 |
5 |
2 |
5 |
2 |
5 |
=3.6×25.4+37.9×6.4
=25.4×(3.6+6.4)+12.5×6.4
=25.4×10+12.5×8×0.8
=254+100×0.8
=254+80
=334
⑤6.8×16.8+19.3×3.2
=16.8×(6.8+3.2)+2.5×3.2
=16.8×10+2.5×4×0.8
=168+10×0.8
=168+8
=176
⑥81.5×15.8+81.5×51.8+67.6×18.5
=81.5×(15.8+51.8)+67.6×18.5
=81.5×67.6+67.6×18.5
=67.6×(81.5+18.5)
=67.6×100
=6760
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