用简便方法计算.不要光等得数,9分之7÷2又5分之1+11分之5×9分之2 7.6×9.912.3-2.45-5.3-4.55 8.8×1251.25×0.25×32 36×(4分之1-6分之1+9分之1)
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![用简便方法计算.不要光等得数,9分之7÷2又5分之1+11分之5×9分之2 7.6×9.912.3-2.45-5.3-4.55 8.8×1251.25×0.25×32 36×(4分之1-6分之1+9分之1)](/uploads/image/z/6679733-5-3.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97.%E4%B8%8D%E8%A6%81%E5%85%89%E7%AD%89%E5%BE%97%E6%95%B0%2C9%E5%88%86%E4%B9%8B7%C3%B72%E5%8F%885%E5%88%86%E4%B9%8B1%EF%BC%8B11%E5%88%86%E4%B9%8B5%C3%979%E5%88%86%E4%B9%8B2+7.6%C3%979.912.3%EF%BC%8D2.45%EF%BC%8D5.3%EF%BC%8D4.55+8.8%C3%971251.25%C3%970.25%C3%9732+36%C3%97%284%E5%88%86%E4%B9%8B1%EF%BC%8D6%E5%88%86%E4%B9%8B1%EF%BC%8B9%E5%88%86%E4%B9%8B1%29)
用简便方法计算.不要光等得数,9分之7÷2又5分之1+11分之5×9分之2 7.6×9.912.3-2.45-5.3-4.55 8.8×1251.25×0.25×32 36×(4分之1-6分之1+9分之1)
用简便方法计算.不要光等得数,
9分之7÷2又5分之1+11分之5×9分之2 7.6×9.9
12.3-2.45-5.3-4.55 8.8×125
1.25×0.25×32 36×(4分之1-6分之1+9分之1)
用简便方法计算.不要光等得数,9分之7÷2又5分之1+11分之5×9分之2 7.6×9.912.3-2.45-5.3-4.55 8.8×1251.25×0.25×32 36×(4分之1-6分之1+9分之1)
9分之7÷2又5分之1+11分之5×9分之2
=9分之7×11分之5+11分之5×9分之2
=11分之5×(9分之7+9分之2)
=11分之5×1
=11分之5
7.6×9.9
=7.6×(10-0.1)
=7.6×10-7.6×0.1
=76-0.76
=75.24
12.3-2.45-5.3-4.55
=(12.3-5.3)-(2.45+4.55)
=7-7
=0
8.8×125
=(1.1×8)×125
=1.1×(8×125)
=1.1×1000
=1100
1.25×0.25×32
=1.25×0.25×(8×4)
=(1.25×8)×(0.25×4)
=10×1
=10
36×(4分之1-6分之1+9分之1)
=36×4分之1-36×6分之1+36×9分之1
=9-6+4
=7