人教版五年级上册数学第一单元第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答案
1整数乘法……到小数第一题答案
(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
2整数乘法……到小数第二题答案
1 | 2 | 3 |
B | C | A |
3整数乘法……到小数第三题答案
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
4整数乘法……到小数第四题答案
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