4.25÷2.5x1o1一1.7。脱式计划

18-(1.4+1.25×2.4) 怎么算？（脱式）~

解原式=18-(1.4+1.25×0.8*3)
=18-(1.4+3)
=18-1.6
=16.4

(1)12/7 -(5/7+0.5)
=(12/7-5/7)-0.5
=1-0.5
=0.5
(2)[1-(0.25+3/8)]÷1/4
=[1-(2/8+3/8)]÷1/4
=(1-5/8)÷1/4
=3/8÷1/4
=3/2
(3)(0.875+1/4)(1/8-1/72)
=(7/8+2/8)(9/72-1/72)
=9/8 ×8/72
=1/8
(3)(7/5-2/5)÷4/5÷(3/7+3/2×4/9)
=1÷4/5÷(3/7+2/3)
=5/4÷(9/21+14/21)
=5/4÷23/21
=105/92=1又 13/92 （你 题目有可能打错了）
解方程
（1) 2X+0.4X=7.2
2.4X=7.2
X=7.2÷2.4
X=3
(2) 5-2/3X=1/3
2/3X=5-1/3
2/3X=14/3
X=14/3÷2/3
X=7
(3) 0.8+1/2X=0.9
1/2X=0.9-0.8
1/2X=0.1
X=0.2
(4)5X-3×7/10=7/5
5X=21/10+14/10
5X=35/10
X=7/10
以后自己做，这么小不自己算，你长大后会算什么？

4.25÷2.5x101一1.7
=1.7x101-1.7
=1.7x101-1.7x1
=1.7x（101-1）
=1.7x100
=170

希望帮到你 望采纳 谢谢 加油

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4.25÷2.5x1o1一1.7。脱式计划视频