解方程(1):4×2.9-2x=4.8 (2):x:0.7=3分之4:9分之1

问题描述:

解方程(1):4×2.9-2x=4.8 (2):x:0.7=3分之4:9分之1
简算 (1):0.7÷[(6分之5-4分之1)×24]

(1):
4×2.9-2x=4.8
11.6-2x=4.8
11.6-4.8=2x
2x=6.8
x=3.4
(2):
x:0.7=3分之4:9分之1
1/9*x=0.7*4/3
x=0.7*4/3*9
x=8.4
0.7÷[(6分之5-4分之1)×24]
=0.7÷[6分之5×24-4分之1×24]
=0.7÷[20-6]
=0.7÷14
=0.05