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102×3.4=?750÷5÷20=?25×0.6×0.4=?1.25×7.85×8=?3.6+7.2+2.8=?脱式计算

题目详情
102×3.4=?750÷5÷20=?25×0.6×0.4=?1.25×7.85×8=?3.6+7.2+2.8=?
脱式计算
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答案和解析
102×3.4
=(100+2)×3.4
=100×3.4+2×3.4
=340+6.8
=346.8
750÷5÷20
=750÷(5×20)
=750÷100
=7.5
25×0.6×0.4
=25×0.4×0.6
=10×0.6
=6
1.25×7.85×8
=1.25×8×7.85
=10×7.85
=78.5
3.6+7.2+2.8
=3.6+(7.2+2.8)
=3.6+10
=13.6