计算简便方法怎么算 77+2.7+2.8+25的简便方法怎么算？

77+2.7+2.8+25的简便方法怎么算？  

77+2.7+2.8+25的简便方法怎么算？

77+2.7+2.8+25
=75+2+2.7+2.3+0.5+25
=75+25+2.7+2.3+2+0.5
=100+5+2+0.5
=107.5

77+2.7+2.8+25的简便

77+2.7+2.8+25
=（77+25）+（2.7+2.8）
=102+5.5
=107.5

77+2.7+2.8+25的简便计算

77+2.7+2.8+25
=77+5.5+23+2
=(77+23)+(5.5+2)
=100+7.5
=107.5

77+2.7+2.8+25用以简便运算

77+2.7+2.8+25用以简便运算
=77+25+（2.7+2.8）
=102+5.5
=107.5

怎么用简便方法计算77+2.7+2.3+25

77+2.7+2.3+25
=77+(2.7+2.3)+25
=77+(5+25)
=77+30
=107

4.05_2.8_2.7用简便方法计算

4.05-2.8-2.7
=4.05-（2.8+2.7）
=4.05-5.5
=-1.45

2.8乘于25简便方法计算

原式
=2.8x25
=(0.7x4)x25
=0.7x(4x25)
=0.7x100
=70
供参考。

2.8×1.55 2.8×0.45简便方法怎么算

原式
=2.8x1.55+2.8x0.45
=2.8x(1.55+0.45)
=2.8x2
=5.6

2.8+3.4-2.8+3.4的简便方法怎么算？

2.8-2.8+3.4+3.4

12.8x2.7-2.8简便方法

12.8X2.7-2.8
=10X2.7+2.8X2.7-2.8
=27+2.8X(2.7-1)
=27+3X1.7-0.2X1.7
=27+5.1-0.34
=32.1-0.34
=31.76