下列各题能简算的要简算.3.1+2.4+1.9+3.6300-288÷2448×(38+56)0.46×98+0.9245×25÷45×2521÷(13+25)÷911.-数学
题文
下列各题能简算的要简算.
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答案
(1)3.1+2.4+1.9+3.6, =(3.1+1.9)+(2.4+3.6), =5+6, =11; (2)300-288÷24, =300-12, =288; (3)48×(
=48×
=18+40, =58; (4)0.46×98+0.92, =0.46×(100-2)+0.92, =0.46×100-0.46×2+0.92, =46-0.92+0.92, =46; (5)
=(
=1×0.16, =0.16; (6)21÷(
=21÷
=21÷(
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