4.7×7.4+4.7×5.1+12.5×3.3怎么用简便算法?
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4.7×7.4+4.7×5.1+12.5×3.3
先把前两项提取公因数4.7
=4.7×(7.4+5.1)+12.5×3.3
=4.7×12.5+12.5×3.3
再提取公因数12.5
=12.5×(4.7+3.3)
=12.5×8
=125×8/10
=1000/10
=100
先把前两项提取公因数4.7
=4.7×(7.4+5.1)+12.5×3.3
=4.7×12.5+12.5×3.3
再提取公因数12.5
=12.5×(4.7+3.3)
=12.5×8
=125×8/10
=1000/10
=100
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简便方法计算如下:
4.7×7.4+4.7×5.1+12.5×3.3
=4.7×(7.4+5.1)+12.5×3.3
=4.7×12.5+12.5×3.3
=(4.7+3.3)×12.5
=8×12.5
=100
4.7×7.4+4.7×5.1+12.5×3.3
=4.7×(7.4+5.1)+12.5×3.3
=4.7×12.5+12.5×3.3
=(4.7+3.3)×12.5
=8×12.5
=100
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4.7×7.4+4.7×5.1+12.5×3.3
=4.7×(7.4+5.1)+12.5×3.3
=4.7×12.5+12.5×3.3
=(4.7+3.3)×12.5
=8×12.5
=10 0
=4.7×(7.4+5.1)+12.5×3.3
=4.7×12.5+12.5×3.3
=(4.7+3.3)×12.5
=8×12.5
=10 0
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利用乘法分配律、用两次就行
原式= 4.7x(7.4+5.1)+12.5x3.3
= 4.7x12.5+12.5x3.3
= 12.5x(4.7+3.3)
= 12.5x8
= 100
原式= 4.7x(7.4+5.1)+12.5x3.3
= 4.7x12.5+12.5x3.3
= 12.5x(4.7+3.3)
= 12.5x8
= 100
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