12.6÷(2.5+3.8)简便运算。
12.6÷(2.5+3.8)简便运算。
=12.6/(2.5+3.8)
=12.6/(6.3)
=2
16.2除以2.5+3.8除以2.5能不能简便运算
可以啊,(16.2+3.8)除以2.5
(3.8-7.7÷2.5)×2.5的简便运算
简便运算
(3.8-7.7÷2.5)×2.5
=3.8×2.5-7.7÷2.5×2.5
=9.5-7.7
=1.8
简便运算2.5×(1.9+1.9+3.8)
2.5×(1.9+1.9+3.8)
=2.5×(1.9+1.9+1.9×2)
=2.5×(1.9×4)
=(2.5×4)×1.9
=10×1.9=19
2.9×[(3.8-5/5)÷2.5]简便运算
2.9×[(3.8-5/5)÷2.5]简便运算
2.9×[(3.8-5/5)÷2.5]
=2.9÷(2.8÷2.5)
=2.9÷1.12
=290/112
=145/56
1.2×3.8 2.5×4可以简便运算吗
应该可以
不过这是一个式子、还是两个式子?
(1+0.2)×(4-0.2)
2.5×4=10 【口算】
12.6×99的简便运算
原式
=12.6*(100-1)
=12.6*100-12.6
=1260-12.6
=1247.4
3.8×98 简便运算
3.8×98
=3.8x(100-2)
=3.8x100-3.8x2
=380-7.6
=372.4
12.6×0.58 1.26×4.2简便运算
12.6×0.58+1.26×4.2
=12.6×0.58+12.6×0.42
=12.6×(0.58+0.42)
=12.6×1
=12.6
3.8+99×3.8的简便运算
=3.8x(1+99)
=3.8x100
=380
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