我学会了吗第1题答案
3.2×0.1=0.32
0.14×5=0.7
0.45×2=0.9
2.8×0.25×4=2.8
4.3×0.8+5.7×0.8=8
30×0.4=12
1.25×0.4=0.5
2.5×0.4=1
我学会了吗第2题答案
0.7×1.2=1.2×0.7(乘法交换律)
(0.8×0.5)×0.4=0.8×(0.5×0.4)(乘法结合律)
(2.4+3.6)×0.5=2.4×0.5+3.6×0.5(乘法分配律)
我学会了吗第3题答案
精确到百分位 | 保留一位小数 | 保留整数 | |
0.34×1.7 | 0.58 | 0.6 | 1 |
0.96×1.1 | 1.06 | 1.1 | 1 |
2.07×3.8 | 7.87 | 7.9 | 8 |
我学会了吗第4题答案
我学会了吗第5题答案
2.79×2.5×0.4
=2.79×(2.5×0.4)
=2.79
1.25×(8+0.8)
=1.25×8+1.25×0.8
=10+1
=11
1.25×0.5×8×0.2
=(1.25×8)×(0.5×0.2)
=10×0.1
=1
3.6×7.1+3.6×2.9
=3.6×(7.1+2.9)
=3.6×10
=36
0.97×9+0.97
=0.97×(9+1)
=0.97×10
=9.7
7.5×101
=7.5×(100+1)
=7.5×100+7.5×1
=750+7.5
=757.5
我学会了吗第6题答案
1.28×30=38.4(万千米)
我学会了吗第7题答案
3.5×(41+39)
=3.5×80
=280(元)
我学会了吗第8题答案
11.11×6666+7778×33.33
=11.11×(2222×3)+7778×33.33
=(11.11×3)×2222+7778×33.33
=33.33×2222+7778×33.33
=33.33×(2222+7778)
=33.33×10000
=333300