4.6÷(0.4×2.3)简便计算
2个回答
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0.23×0.4×0.5
103×0.23
1.2×98
=0.23×(0.4×0.5)
=(100+3)×0.23
=(1+0.2)×98
=0.23×0.2
=100×0.23+3×0.23
=1×98+0.2×98
=0.046
=23+0.69
=98+19.6
=23.69
=117.6
2.4×1.25
=0.3×8×1.25
那个3.8×305+6.2×3.5不能简便计算啊,是
=0.3×(8×1.25)
不你抄错啦?
=0.3×100
=30
103×0.23
1.2×98
=0.23×(0.4×0.5)
=(100+3)×0.23
=(1+0.2)×98
=0.23×0.2
=100×0.23+3×0.23
=1×98+0.2×98
=0.046
=23+0.69
=98+19.6
=23.69
=117.6
2.4×1.25
=0.3×8×1.25
那个3.8×305+6.2×3.5不能简便计算啊,是
=0.3×(8×1.25)
不你抄错啦?
=0.3×100
=30
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