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用递等式计算下面各题,能简便的要简便25×102125×32×2553×25+530×7.51.375+0.35+2.654.8+5.07+2.2+4.93103×99+103

题目详情
用递等式计算下面各题,能简便的要简便
25×102              125×32×25       53×25+530×7.5
1.375+0.35+2.65                       4.8+5.07+2.2+4.93103×99+103                         
12×(324-285)÷26

25×102              125×32×25       53×25+530×7.5
1.375+0.35+2.65                       4.8+5.07+2.2+4.93103×99+103                         
12×(324-285)÷26
25×102              125×32×25       53×25+530×7.51.375+0.35+2.65                       4.8+5.07+2.2+4.93103×99+103                         12×(324-285)÷2625×102              125×32×25       53×25+530×7.525×102              125×32×25       53×25+530×7.51.375+0.35+2.65                       4.8+5.07+2.2+4.93103×99+103                         1.375+0.35+2.65                       4.8+5.07+2.2+4.93103×99+103                         12×(324-285)÷2612×(324-285)÷26
▼优质解答
答案和解析
(1)25×102
=25×(100+2)
=25×100+25×2
=2500+50
=2550;

(2)125×32×25
=125×(4×8)×25
=(125×8)×(4×25)
=1000×100
=100000;

(3)53×25+530×7.5
=53×25+53×75
=53×(25+75)
=53×100
=5300;

(4)1.375+0.35+2.65
=1.375+(0.35+2.65)
=1.375+3
=4.375;

(5)4.8+5.07+2.2+4.93
=(4.8+2.2)+(5.07+4.93)
=7+10
=17;

(6)103×99+103
=103×(99+1)
=103×100
=10300;

(7)12×(324-285)÷26
=12×39÷26
=468÷26
=18.