怎样简便就怎样算.7×(27+38)×815÷9+15÷980.32×6.7+3.2×0.3349×[34-(316+14)].-数学
题文
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答案
(1)7×(
=7×8×
=16+21, =37; (2)
=
=(
=1×
=
(3)0.32×6.7+3.2×0.33, =3.2×0.67+3.2×0.33, =(0.67+0.33)×3.2, =1×3.2, =3.2; (4)
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题文
|
答案
(1)7×(
=7×8×
=16+21, =37; (2)
=
=(
=1×
=
(3)0.32×6.7+3.2×0.33, =3.2×0.67+3.2×0.33, =(0.67+0.33)×3.2, =1×3.2, =3.2; (4)
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