Question

3.2乘以2.5简便方法计算。

Answer 1

3.2乘以2.5简便方法计算。

3.2×2.5
=（0.8×4）×2.5
=0.8×（4×2.5）
=0.8×10
=8

简便方法计算。 0.94乘以2.5减0.45 = = =

0.94*2.5-0.45=（1-0.06）*2.5-0.45=1*2.5-0.06*2.5-0.45=2.5-0.15-0.45=2.5-0.6=1.9

7.5乘以3.1除以2.5简便方法计算

7.5×3.1÷2.5
＝7.5÷2.5×3.1
＝3×3.1
＝9.3
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7.5乘以0.17加上0.49乘以2.5用简便方法计算

7.5x0.17+0.49x2.5
=3x2.5x0.17+0.49x2.5
=2.5x0.51+0.49x2.5
=2.5x(0.51+0.49) 【乘法分配律】
=2.5x1
=2.5

7.35-7.25+5.5乘以2.5用简便方法计算

原式
=（7.35-7.25+5.5）x2.5
=(0.1+5.5)x2.5
=5.6x2.5
=(1.4x4)x2.5
=1.4x(4x2.5)
=1.4x10
=14

10-3.2乘以1.6能用简便方法计算吗?

原式
=10-3.2x1.6
=10-(3x1.6+0.2x1.6)
=10-(4.8+0.32)
=10-5.12
=4.88
供参考。

2.5×3.2×12.5简便方法计算

计算：
2.5×3.2×12.5
=2.5x4x0.8x12.5
=10x10
=100

简便方法计算0.42乘以160加36乘1.6减去34乘3.2

0.42乘以160加36乘1.6减去34乘3.2
=42乘以1.6加36乘1.6减去68乘1.6
=（42+36-68）×1.6
=10×1.6
=16

用简便方法计算2.7乘3.2 +3.2乘2.3 +2.3乘2.7用简便算法计算

2.7*3.2 +3.2*2.3 +2.3*2.7=（2.7+2.3）*3.2+2.3*2.7=5*3.2+2.3*2.7=16+6.21=22.21

37.5加4.5除以1.8乘以2.5用简便方法计算

37.5+4.5÷1.8x2.5
=37.5+9x0.5x2.5÷（9x0.2）
=37.5+0.5x2.5÷0.2
=37.5+1.25÷（1/5）
=37.5+1.25x5
=37.5+6.25
=43.75
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