7.2*99怎么简便计算啊,
7.2*99怎么简便计算啊,
您好:
7.2x99
=7.2x(100-1)
=7.2x100-7.2x1
=720-7.2
=712.8
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7.2*99怎么简便计算
7.2*99
=7.2*(100-1)
=720-7.2
=112.8
2.7+7.2x99+4.5简便计算
2.7+7.2x99+4.5
=2.7+4.5+7.2x99
=7.2+7.2×99
=7.2×(1+99)
=7.2×100
=720
99×99简便计算怎么算
解:可利用平方和公式
(a-b)^2=a^2-2ab+b^2
99×99
=(100-1)^2
=100^2-2×100+1
=10000-200+1
=9801
7.2×1.23怎么简便计算?
7.2×1.23怎么简便计算?
7.2×1.23
=7.2*(1+0.2+0.03)
=7.2*1+7.2*0.2+7.2*0.03
=8.856
12.5乘7.2 怎么简便计算
12.5*7.2=125*0.72=(125*8)*0.09=1000*0.09=90
99*76 99怎么简便计算
99*76=(100-1)*76=7600-76=7524
2.7×99和7.2×8.4 2.8×8.4和4.8×0.25简便计算
2.7×99
=2.7×(100-1)
=2.7×100-2.7×1
=270-2.7
=267.3
7.2×8.4+2.8×8.4
=(7.2+2.8)×8.4
=10×8.4
=84
4.8×0.25
=1.2×(4×0.25)
=1.2×1
=1.2
7.2*1.02 简便计算
1.
7.2*(1+0.02)
=7.2+(7+0.2)*0.02
=7.2+0.14+0.004
=7.344
2.
68*(1-0.01)
=68-0.68
=67.32
0.9÷7.2 简便计算
0.9÷7.2
=0.9÷(0.9x8)
=0.9÷0.9÷8
=1÷8
=1/8
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