人教版五年级上册数学第1单元第1章小数乘法部分整数乘法运算定律推广到小数学法大视野详细解答过程和答案
整数乘法……到小数第1题详细解答过程和答案(6.4×0.8)×12.5=12.5×(0.8×6.4)
(6.4+4.4)×0.5=6.4×0.5+4.4×0.5
10.2+8.6=5.1×8.6+5.1×8.6
2.5×0.72+7.5×0.72=(2.5+7.5)×0.72
2、25×4=100
125×8=1000
整数乘法……到小数第2题详细解答过程和答案
123BCA
整数乘法……到小数第3题详细解答过程和答案
0.7×0.4×2.5=0.4×2.5=1×0.7=0.7
0.89×101=89.89
1.2×2.5+8.8×2.5=1.2×2.5=3,8.8×2.5=22,3+22=25
整数乘法……到小数第4题详细解答过程和答案
65.4×0.67+6.45×3.1+0.654×2
=65.4×(0.67+0.31+0.02)
=65.4×1
=65.4
2.015×7.3+20.15×0.37-2.015
=2.015×(7.3+3.7-1)
=2.015×10
=20.15
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