脱式计算.(能简算的要简算)(1)975×0.25+934×76-9.75(2)845÷[7.8+58×(234-1.15)](3)[2-(3.75×.113-225÷0.6)]÷0.2(4)1+216+3112?+4120+5130+6142+7156+8172.-数学
题文
脱式计算.(能简算的要简算) (1)975×0.25+9
(2)
(3)[2-(3.75×.1
(4)1+2
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答案
(1)975×0.25+9
=9.75×25+9.75×76-9.75, =9.75×(25+76-1), =9.75×100, =975; (2)
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