列式计算(1)一个数的2倍与3.8的和是4.6,这个数是多少?(列方程解)(2)1.5与0.75的和除18所得的商再加上2.4,和是多少?
(1)设这个数为x,由题意得:
2x+3.8=4.6,
2x=0.8,
x=0.4;
答:这个数是0.4.
(2)18÷(1.5+0.75)+2.4,
=18÷2.25+2.4,
=8+2.4,
=10.4.
答:和是10.4.
2x+3.8=4.6,
2x=0.8,
x=0.4;
答:这个数是0.4.
(2)18÷(1.5+0.75)+2.4,
=18÷2.25+2.4,
=8+2.4,
=10.4.
答:和是10.4.
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第1个回答 2020-02-15
(1)设这个数为x,由题意得:
2x+3.8=4.6,
2x=0.8,
x=0.4;
答:这个数是0.4.
(2)18÷(1.5+0.75)+2.4,
=18÷2.25+2.4,
=8+2.4,
=10.4.
答:和是10.4.
2x+3.8=4.6,
2x=0.8,
x=0.4;
答:这个数是0.4.
(2)18÷(1.5+0.75)+2.4,
=18÷2.25+2.4,
=8+2.4,
=10.4.
答:和是10.4.