计算下面各题,能用简便方法计算的用简便方法计算.41×1017.8+310+2.2+71072×(38+49)2.5×1.25×32[1-(15+310)]÷14(23-712)÷(27+18)-数学
题文
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答案
(1)41×101, =41×100+41×1, =4100+41, =4141; (2)7.8+
=(7.8+2.2)+(
=10+1, =11; (3)72×(
=72×
=27+32, =59; (4)2.5×1.25×32, =(2.5×4)×(1.25×8), =10×10, =100; (5)[1-(
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