5x +4×(2x +7)=41
解方程.(1)5X-7×1.2=41(2)4(X-2.7)=6.8(3)2X+1.5X=56(4)X-14.5=8.6....
解方程.
(1)5X-7×1.2=41 (2)4(X-2.7)=6.8
(3)2X+1.5X=56 (4)X-14.5=8.6. 展开
(1)5X-7×1.2=41 (2)4(X-2.7)=6.8
(3)2X+1.5X=56 (4)X-14.5=8.6. 展开
展开全部
(1)5X-7×1.2=41
5X-8.4=41
5X-8.4+8.4=41+8.4
5X=49.4
5X÷5=49.4÷5
X=9.88
(2)4(X-2.7)=6.8
4X-4×2.7=6.8
4X-10.8=6.8
4X-10.8+10.8=6.8+10.8
4X=17.6
4X÷4=17.6÷4
X=4.4
(3)2X+1.5X=56
(2+1.5)X=56
3.5X=56
3.5X÷3.5=56÷3.5
X=16
(4)X-14.5=8.6
X-14.5+14.5=8.6+14.5
X=23.1
5X-8.4=41
5X-8.4+8.4=41+8.4
5X=49.4
5X÷5=49.4÷5
X=9.88
(2)4(X-2.7)=6.8
4X-4×2.7=6.8
4X-10.8=6.8
4X-10.8+10.8=6.8+10.8
4X=17.6
4X÷4=17.6÷4
X=4.4
(3)2X+1.5X=56
(2+1.5)X=56
3.5X=56
3.5X÷3.5=56÷3.5
X=16
(4)X-14.5=8.6
X-14.5+14.5=8.6+14.5
X=23.1
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