7.8乘99的简便计算
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7.8乘99的简便计算
7.8×99
=7.8×(100-1)
=7.8×100-7.8×1
=780-7.8
=780-(10-2.2)
=780-10+2.2
=770+2.2
=772.2
7.8x99
=7.8x(100-1)
=7.8x100-7.8x1
=780-7.8
=772.2
7.8*100-7.8+0.78
=780-7.8+0.78
=772.2+0.78
=7720.98
7.8x99
=7.8x(100-1)
=7.8x100-7.8
=780-7.8
=772.2
7.8*(100-1)=780-7.8=772.2
7.8×99
=7.8×(100-1)
=7.8×100-7.8×1
=780-7.8
=772.2
7.8x99
=7.8x(100-1)
=7.8x100-7.8
=780-7.8
=772.2