用递等式计算(1)1379+450÷18×40(2)(3.2÷16+10.8)÷22(3)511×725+725×611(4)14×17÷(56-34)-数学
题文
用递等式计算 (1)1379+450÷18×40 (2)(3.2÷16+10.8)÷22 (3)
(4)
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答案
(1)1379+450÷18×40, =1379+25×40, =1379+1000, =2379; (2)(3.2÷16+10.8)÷22, =(0.2+10.8)÷22, =11÷22, =0.5; (3)
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(4)
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