来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/10/09 00:40:36
(2007•淮安模拟)下面各题怎样简便怎样算(求未知数X).
4.02-1.36-2.64 | (1-
(1)4.02-1.36-2.64, =4.02-(1.36+2.64), =4.02-4, =0.02;
(2)(1- 6 7)÷ 7 3× 3 7, = 1 7÷ 7 3× 3 7, = 1 7× 3 7× 3 7, = 9 343;
(3) 5 14+( 9 14− 4 9), = 5 14+ 9 14- 4 9, =1- 4 9, = 5 9;
(4)X: 3 4= 2 5: 10 3, 10 3X= 3 4× 2 5, 10 3X= 3 10, 10 3X÷ 10 3= 3 10÷ 10 3, X=
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