80%×0.25-60%÷4 120%X- 4 5 X=0.8 1.2×85+16× 6 5 -120% 2 3
80%×0.25-60%÷4120%X-45X=0.81.2×85+16×65-120%23:4=X:124.8×3.9+6.1×4451.8X=0.52....
80%×0.25-60%÷4 120%X- 4 5 X=0.8 1.2×85+16× 6 5 -120% 2 3 :4=X: 1 2 4.8×3.9+6.1×4 4 5 1.8 X = 0.5 2 .
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(1)80%×0.25-60%÷4, =0.8×0.25-0.6×
=0.8×0.25-0.6×0.25, =(0.8-0.6)×0.25, =0.2×0.25, =0.05; (2)120%X-
(120%-
(1.2-0.8)X=0.8, 0.4X=0.8, 0.4X÷0.4=0.8÷0.4, X=2; (3)1.2×85+16×
=1.2×85+16×1.2-1.2, =1.2×(85+16-1), =1.2×100, =120; (4)
4X=
4X=
4X÷4=
X=
(5)4.8×3.9+6.1×4
=4.8×3.9+6.1×4.8, =4.8×(3.9+6.1), =4.8×10, =48; (6)
0.5X=1.8×2, 0.5X÷0.5=3.6÷0.5, X=7.2. |
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