递等式计算(1)14×105-1890÷18(2)1.25×(3.56×8)(3)63×58+63÷83(4)72×( 59-512)-10(5
递等式计算(1)14×105-1890÷18(2)1.25×(3.56×8)(3)63×58+63÷83(4)72×(59-512)-10(5)5.4减去3.6除以1.2...
递等式计算(1)14×105-1890÷18(2)1.25×(3.56×8)(3)63×58+63÷83(4)72×( 59-512)-10(5)5.4减去3.6除以1.2的商,所得的差再乘0.5,积是多少?(6)32比一个数的25%多18,求这个数.(用方程解)
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(1)14×105-1890÷18
=1470-105
=1365
(2)1.25×(3.56×8)
=(和含码猛1.25×8)×3.65
=10×3.65
=36.5
(3)63×
+63÷
=63×
+63×
=63×(
+
)
=63×1
=63
(4)72×(
-
)-10
=72×
-72×
-10
=40-30-10
=0
(5)(5.4-3.6÷1.2)×0.5
=2.4×0.5
=1.2
答:积是1.2.
(6)32-25%x=18
32-0.25x=18
唤模笑 0.25x=14
x=56
答:这个数56.
=1470-105
=1365
(2)1.25×(3.56×8)
=(和含码猛1.25×8)×3.65
=10×3.65
=36.5
(3)63×
5 |
8 |
8 |
3 |
=63×
5 |
8 |
3 |
8 |
=63×(
5 |
8 |
3 |
8 |
=63×1
=63
(4)72×(
5 |
9 |
5 |
12 |
=72×
5 |
9 |
5 |
12 |
=40-30-10
=0
(5)(5.4-3.6÷1.2)×0.5
=2.4×0.5
=1.2
答:积是1.2.
(6)32-25%x=18
32-0.25x=18
唤模笑 0.25x=14
x=56
答:这个数56.
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