99.9乘以7.8加33.3乘以6.6简便验算
99.9乘以7.8加33.3乘以6.6简便验算
99.9乘以7.8加33.3乘以6.6
=99.9x7.8+33.3x3x2.2
=99.9x7.8+99.9x2.2
=99.9x(7.8+2.2)
=99.9x10
=999
99.9乘以1.25加33.3乘以6.25简便计算
99.9乘以1.25加33.3乘以6.25
=33.3x3x1.25+33.3x6.25
=33.3x(3.75+6.25)
=33.3x10
=333
33.3乘以33.3+66.6乘以66.7+66.7乘以66.7的简便计算
33.3*33.3+66.6*66.7+66.7*66.7
＝33.3*33.3+(2*33.3)*66.7+66.7*66.7
利用公式a^2+b^2+2ab=(a+b)^2 <a^2表示a的平方>
得
33.3*33.3+(2*33.3)*66.7+66.7*66.7
= (33.3+66.7)^2
= 100*100
= 10000
66.6乘以10.2+33.3乘以79.6的简便计算咋简便
66.6×10.2+33.3×79.6
=33.3×20.4+33.3×79.6
=33.3×（20.4+79.6）
=33.3×100
=3330
10.6乘以2.7加10.6乘以7.8简便计算
=10.6ⅹ(2.7+7.8)
=10.6x(10+0.5)
=10.6x10+10.6x0.5
=106+5.3
=111.3
2.04乘以99.9加1.94乘以66.6用简便方法计算
2.04×99.9+1.94×66.6
=6.12×33.3+3.88×33.3
=（6.12+3.88）×33.3
=10×33.3
=333
7.8乘以6.4加3.6乘以1.3加3.6乘以6.5的简便演算法是
简便计算
7.8×6.4+3.6×1.3+3.6×6.5
=7.8×6.4+3.6×（1.3+6.5）
=7.8×6.4+3.6×7.8
=7.8×（6.4+3.6）
=7.8×10
=78
33.3乘以44.5减66.6乘以22.2的简便计算
原式
=33.3x44.5-66.6x22.2
=33.3x44.5-33.3x2x22.2
=33.3x44.5-33.3x44.4
=33.3x(44.5-44.4)
=33.3x0.1
=3.33
用简便方法计算15.5乘以6.6加22乘以5.35
15.5×6.6+22×5.35
=46.5×2.2+2.2×53.5
=（46.5+53.5）×2.2
=100×2.2
=220
99.9乘以99.9怎么简便算
99.9×99.9
=99.9×(100-0.1)
=99.9×100-99.9×0.1
=9990-9.99
=9980.01
99.9×99.9
=(100-0.1)²
=10000-20+0.01
=9980+0.01
=9980.01
