列式计算:(1)4 1 2 乘以 2 3 的积减去1.5,再除以0.5,商是多少?(2)甲数是18 2 3 ,乙数的 5 7 是40,甲数是乙数的百分之几?
(1)(4 1/2×2/3-1.5)÷0.5
=(9/2×2/3-1.5)÷0.5
=(3-1.5)÷0.5
=1.5÷0.5
=3
(2)∵乙数的5/7是40;
∴乙数=40÷5/7
=40×7/5
=56
又∵甲数是18 2/3
∴甲数是乙数的:18 2/3÷56
=56/3÷56
=56/3×1/56
=1/3
=(9/2×2/3-1.5)÷0.5
=(3-1.5)÷0.5
=1.5÷0.5
=3
(2)∵乙数的5/7是40;
∴乙数=40÷5/7
=40×7/5
=56
又∵甲数是18 2/3
∴甲数是乙数的:18 2/3÷56
=56/3÷56
=56/3×1/56
=1/3
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第1个回答 推荐于2016-05-29
(1)(4
=(
=(3-1.5)÷0.5, =1.5÷0.5, =3. 答:商是3. (2) 18
=
=
≈33.3% 答:甲数是乙数的33.3%. |