解方程 ×-30%×=4.9?
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×-30%×=4.9
(1-30%)x=4.9
70%x=4.9
x=4.9÷70%
x=7,4,×-30%×=4.9
(1-30%)x=4.9
70%x=4.9
x=4.9÷70%
x=7 (蛮容易滴),2,×-30%×=4.9
(1-30%)x=4.9
70%x=4.9
x=4.9÷70%
x=7,1,x-30%x=4.9
1x-30%x=490%
(1-30%)x=490%
70%x=490%
x=490%÷70%
x=4.9÷0.7
x=7,0,X - 15%X = 68 3.5X+1.8=12.3 3.6X÷2=2.16 0.8X-4=1.6
5X÷2=10 X-0.25X=3 4+0.7X=102 X-0.125X=8 x-0.375x=3/4
5 X-2.4×5=8 15X÷2=60 4X+X=3.15 3.4X+1.8=8.6
5X-X=2.4 1.5...,0,
(1-30%)x=4.9
70%x=4.9
x=4.9÷70%
x=7,4,×-30%×=4.9
(1-30%)x=4.9
70%x=4.9
x=4.9÷70%
x=7 (蛮容易滴),2,×-30%×=4.9
(1-30%)x=4.9
70%x=4.9
x=4.9÷70%
x=7,1,x-30%x=4.9
1x-30%x=490%
(1-30%)x=490%
70%x=490%
x=490%÷70%
x=4.9÷0.7
x=7,0,X - 15%X = 68 3.5X+1.8=12.3 3.6X÷2=2.16 0.8X-4=1.6
5X÷2=10 X-0.25X=3 4+0.7X=102 X-0.125X=8 x-0.375x=3/4
5 X-2.4×5=8 15X÷2=60 4X+X=3.15 3.4X+1.8=8.6
5X-X=2.4 1.5...,0,
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