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简介:
8-2.45-1.55
=8-(2.45+1.55)
=8-4
=4
0.32×403
=0.32×(400+3)
=0.32×400+0.32×3
=128+0.96
=128.96
0.25×36
=0.25×4×9
=1×9
=9
12.7-(3.7+0.84)
=12.7-3.7-0.84
=9-0.84
=8.14
3.25+1.79-0.59+1.75
=(3.25+1.75)+(1.79-0.59)
=5+1.2
=6.2
23.4-0.8-13.4-7.2
=(23.4-13.4)-0.8-7.2
=10-(0.8+7.2)
=10-8
=2