Question

7.2*61.3 73.8*2.8简便计算怎么做

Answer 1

7.2*61.3 73.8*2.8简便计算怎么做

7.2*61.3+73.8*2.8
=7.2*61.3+73.8*10-73.8*7.2
=7.2＊（61.3-73.8）+738
=7.2＊（-12.5）+738
=0.9＊8＊（-12.5）+738
=-90+738
=648

7.2乘14.5+17乘2.8怎么做?简便计算, 7.2×14.5+17×2.8 简便计算

7.2×14.5+17×2.8
=7.2×14.5+14.5×2.8 +2.5×2.8
=14.5×10+2.5×4×0.7
=145+10×0.7
=152

简便计算,13.2-7.2 2.8

13.2-7.2+2.8
=13.2+2.8-7.2
=16-7-0.2
=9-0.2
=8.8

7.2 4.28 2.8 0.72简便计算

原式
=7.2+4.28+2.8+0.72
=（7.2+2.8）+（4.28+0.72）
=10+5
=15
供参考。

5.8*7.2 5.8*2.8简便计算

利用乘法分配律
5.8*7.2+5.8*2.8简便计算
=5.8x(7.2+2.8)
=5.8x10
=58

7.2-4.9+2.8简便计算

答案是5.1
7.2-4.9+2.8
=7.2-（4.9-2.8）
=7.2-2.1
=5.1

7.2 2.8×1╱4用简便计算

7.2 2.8×1╱4用简便计算
7.2 2.8×1╱4
=7.2+0.7
=7.9
直接计算

2.8＋ 7.2*0.81的简便计算

=2.8+7.2*（0.8+0.01）
=2.8+5.76+0.072
=8.632

9.05+7.2-1.05+2.8简便计算

9.05+7.2-1.05+2.8
=（9.05-1.05）+（7.2+2.8）
=8+10
=18