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脱式计算:(能简算的要写出主要简算步骤) 2.87+5...

1、原式 =2.87×4 =11.48 2、原式 =36.5x(999+1) =36.5×1000 =36500 3、原式 =0.6x3.6÷0.9 =0.6×4 =2.4

(1)38.67+68.23+45.8=106.9+45.8=152.7(2)98.2-37.18-10.82=98.2-(37.18+10.82)=98.2-48=50.2(3)56.23+31.07-54.1=87.3-54.1=33.2(4)32.6+58.04+61.96=32.6+(58.04+61.96)=32.6+120=152.6(5)100-(28.4+32.05)=100-60.45=39.55(...

(1)(136-87)×15÷3 =49×15÷3=735÷3=245;(2)542×6+158×6=(542+158)×6=700×6=4200;(3)98×101 =98×100+98×1=9800+98=9898;(4)168+32÷8=168+4=172;(5)101×42-42=(101-1)×42=100×42=4200;(6)4.9+0.1-4.9+0.1=4.9-4.9+(0.1+0.1...

5.89-3.14+2.87 =2.75+2.87 =5.62

四则运算:25乘28除以7 32乘2加27 97减5乘17 49乘32减37 55加28乘4 37加4乘9126乘45加63 15乘27减46 93乘35加64 28乘6加37 48乘4加36 549乘4加5637乘5加38等.小数:1.3加2.5 2.4减2.1 3.5加2.3 4.9减3 6.1加3.5 3.6减2.1 8.4加6.37.7减2.9 5.9加...

四点零五除以零点吧一点2.87的简便计算 四点零五除以零点吧一点2.87 =4.05÷0.81+2.87 =5+2.87 =7.87

简便计算: 28.7×1.6÷2.87 =(28.7÷2.87)×1.6 =10×1.6 =16 930÷5÷0.6 =930÷(5×0.6) =930÷3 =310 28.46÷0.25÷4 =28.46÷(0.25×4) =28.46÷1 =28.46

(1)560÷3.5,=560÷(0.5×7),=560÷7÷0.5,=80÷0.5,=160;(2)3.9÷26,=3.9÷13÷2,=0.3÷2,=0.15;(3)2.87÷0.25,=(2.87×4)÷(0.25×4),=11.48÷1,=11.48.故答案为:(1)160;(2)13、2、0.3÷2、0.15;(3)2.87×4、11.48÷1、11.48.

2.87÷(7x0.5) =2.87÷7÷0.5 =0.41÷0.5 =0.82

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