1.25×3.2×5怎样简便运算?
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1.25×3.2×5怎样简便运算?
1.25×3.2×5
=1.25x8x0.4x5
=(1.25x8)x(0.4x5)
=10x2
=20
把3.2拆成4和8
1.25×3.2×5=1.25×8×0.4×5=10×2=20
1.25x4X0.8×5
=(1.25x4)X(0.8×5)
=5X4
=20
1.25×3.2×5怎样简便运算?
1.25×3.2×5
=1.25x8x0.4x5
=(1.25x8)x(0.4x5)
=10x2
=20
把3.2拆成4和8
1.25×3.2×5=1.25×8×0.4×5=10×2=20
1.25x4X0.8×5
=(1.25x4)X(0.8×5)
=5X4
=20