7.5^2*2.4-2.5^2*2.4 29.8^2-0.2^2 (1)7.5^2*2.4-2.5^2*2.4 (2) 29.8^2-0.2^2
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7.5^2*2.4-2.5^2*2.429.8^2-0.2^2(1)7.5^2*2.4-2.5^2*2.4(2)29.8^2-0.2^27.5^2*2.4-2.5^2*2.429.8^2-0.2^2(
7.5^2*2.4-2.5^2*2.4 29.8^2-0.2^2 (1)7.5^2*2.4-2.5^2*2.4 (2) 29.8^2-0.2^2
7.5^2*2.4-2.5^2*2.4 29.8^2-0.2^2
(1)7.5^2*2.4-2.5^2*2.4
(2) 29.8^2-0.2^2
7.5^2*2.4-2.5^2*2.4 29.8^2-0.2^2 (1)7.5^2*2.4-2.5^2*2.4 (2) 29.8^2-0.2^2
7.5^2*2.4-2.5^2*2.4
=(7.5²-2.5²)×2.4
=(7.5+2.5)×(7.5-2.5)×2.4
=10×5×2.4
=5×24
=120
29.8^2-0.2^2
=(29.8+0.2)×(29.8-0.2)
=30×29.6
=3×296
=3×(300-4)
=900-12
=888
7.5^2*2.4-2.5^2*2.4 29.8^2-0.2^2 (1)7.5^2*2.4-2.5^2*2.4 (2) 29.8^2-0.2^2
2.4×2除以2.4×2
巧算:(4.8×7.5×8.1)÷(2.5×2.7×2.4)
2.4×2.5-4x=2解方程
x-2.4=1/2x+2.4
2.4/2.5+1.6*2.5
2:2.4求比值
8.56+7.5+2.44-2.5 0.35*2.4 8.56-7.5+2.44-2.5 3.78/2.5/0.4用简便方法计算
(2.4-x)^2+(0.7+2x)^2=2.5^2解方程
0.36*2.5-2.4*0.125
2(2.4+x)=14.
2.4:2/3=3.2:
13-(x+2)=2.4
2.4.
2.4.
2.4.
求未知数 4x-2.4x3=2 5 :2.5=x:2
解这个方程2x+2.4x+2.4=6.8