如题所述
第1个回答 2021-12-25
这样够不够简单2.9×1.974
=（3－0.1）×（2－0.26）
=6－0.78－0.2+0.026
=6－1+0.22－0.2+0.026
=5.046
=（3－0.1）×（2－0.26）
=6－0.78－0.2+0.026
=6－1+0.22－0.2+0.026
=5.046
第2个回答 2021-12-25
简单计算方法是：
原式=（3.0-0.1）x1.974
=3x1.974-0.1x1.974
= 5.922-0.1974
=5.7246
原式=（3.0-0.1）x1.974
=3x1.974-0.1x1.974
= 5.922-0.1974
=5.7246
第3个回答 2021-12-25
可以通过换算得出2.9=3-0.1，所以原式等于1.974×（3-0.1）运用乘法分配律就是1.974×3-1.974×0.1=5.7246
第4个回答 2021-12-25
可以通过换算得出2.9=3-0.1，所以原式等于1.974×（3-0.1）运用乘法分配律就是1.974×3-1.974×0.1=5.7246
第5个回答 2021-12-24
2.96x40
=（3-0.04）x40
=3x40-0.04x40
=120-1.6
=118.4
1、0.25x0.73x4 3.65x10.1
=0.25x4x0.73 =3.65x（10+0.1）
=1x0.73 =3.65x10+3.65x0.1
=0.73 =36.5+0.365
=36.865
2、0.85x9.9 12.9x99+12.9
=0.85x（10-0.1） =12.9x（99+1）
=0.85x10-0.85x0.1 =12.9x100
=8.5-0.085 =1290
=8.415
3、3.72×3.5＋6.28×3.5 1.25×2.5×32
=（3.72＋6.28)×3.5 =(1.25×8)×(2.5×4)
=10×3.5 =10×10
=35 =100
=（3-0.04）x40
=3x40-0.04x40
=120-1.6
=118.4
1、0.25x0.73x4 3.65x10.1
=0.25x4x0.73 =3.65x（10+0.1）
=1x0.73 =3.65x10+3.65x0.1
=0.73 =36.5+0.365
=36.865
2、0.85x9.9 12.9x99+12.9
=0.85x（10-0.1） =12.9x（99+1）
=0.85x10-0.85x0.1 =12.9x100
=8.5-0.085 =1290
=8.415
3、3.72×3.5＋6.28×3.5 1.25×2.5×32
=（3.72＋6.28)×3.5 =(1.25×8)×(2.5×4)
=10×3.5 =10×10
=35 =100
