简便计算.(1) 13 5 7 -5.8+ 3 2 7 +4.2 (2)7.7÷ 1 1 3 +0.75×4
简便计算.(1)1357-5.8+327+4.2(2)7.7÷113+0.75×4310(3)(56-0.25+13)×2.4(4)212×4.625+638×250%-...
简便计算.(1) 13 5 7 -5.8+ 3 2 7 +4.2 (2)7.7÷ 1 1 3 +0.75×4 3 10 (3)( 5 6 -0.25+ 1 3 )×2.4(4)2 1 2 ×4.625+6 3 8 ×250%-2.5.
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(1) 13
=( 13
=17-5.8+4.2 =15.4; (2)7.7÷ 1
=7.7÷
=7.7×
=7.7×0.75+0.75×4
=0.75×(7.7+4
=0.75×(7
=0.75×12 =9; (3)(
=(
=
=5×0.4-0.6+0.8 =2-0.6+0.8 =2.2; (4)2
=2.5×4.625+6.375×2.5-2.5 =2.5×(4.625+6.375-2.5) =2.5×8.5 =21.25. |
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