1.02×5.5和18.8×101-18.8、2.5×4.4用简便运算计算

你这道题可以用“拆分法”和“乘法分配律”来做
1、 1.02×5.5……
=（1＋0,02）×5,5
=1×5.5＋0.02×5.5
=5,5＋0.11
=5.61
2、18.8×101-18.8
=18.8×（101-1）
=1880
3、 2.5×4.4 ……这样想：把4.4分成（4×1.1）
=2.5×4×1.1
=10×1.1
=11
另2.5×4.4
=2.5×（4＋0.4）
=2.5×4＋2.5×0.4
=10＋1
=11

1.02×5.5
= 1×5.5+0.02×5.5
= 5.5+0.11
= 5.61
18.8×101-18.8
= 18.8×（101 - 1）
= 18.8×100
=1880
2.5×4.4
=2.5×4×1.1
=10×1.1
=11

1.02×5.5
=(1+0.02)×5.5
=1×5.5+0.02×5.5
=5.5+0.11
=5.61
18.8×101-18.8
=18.8×101-18.8×1
=18.8×(101-1)
=18.8×100
=1880
2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11

1.02×5.5
=（1+0.02）×5.5
=1×5.5+0.02×5.5
=5.5+0.11
=5.65
18.8×101-18.8、
=18.8×（101-1）
=18.8×100
=1880
2.5×4.4
=2.5×（4+0.4）
=2.5×4+2.5×0.4
=10+1
=11