7.2*1.3+3.8*2.8的简便运算
7.2*1.3+3.8*2.8
=4×(2.34+2.66)
=4×5
=20
7.2×1.3+3.8×2.8
=(10-2.8)×1.3+3.8×2.8
=10×1.3-2.8×1.3+3.8×2.8
=13+2.8×(3.8-1.3)
=13+7×0.4×2.5
=13+7
=20
7.2*1.3+3.8*2.8
=8×(0.9*1.3)+8×(1.9*0.7)
=8×(1.17+1.33)
=8×2.5
=20
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7.2*1.3+3.8*2.8
=4×(2.34+2.66)
=4×5
=20
7.2×1.3+3.8×2.8
=(10-2.8)×1.3+3.8×2.8
=10×1.3-2.8×1.3+3.8×2.8
=13+2.8×(3.8-1.3)
=13+7×0.4×2.5
=13+7
=20
7.2*1.3+3.8*2.8
=8×(0.9*1.3)+8×(1.9*0.7)
=8×(1.17+1.33)
=8×2.5
=20