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脱式计算.12÷[(58?12)×13] (23?47)×21+45 (7?...

(1)12÷[(58?12)×13]=12÷[18×13]=12÷124=12;(2)(23?47)×21+45=23×21?47×21+45=14-12+45=2+45=245;(3)(7?6×23)÷79=(7?4)÷79=3÷79=277;(4)(78?14)÷(59?13)=58÷29=4516.

(1)16-65+8.4-45,=16-1.2+8.4-0.8,=(16+8.4)-(1.2+0.8),=24.4-2,=22.4;(2)1.25×32×2.5,=1.25×8×4×2.5,=(1.25×8)×(4×2.5),=10×10,=100;(3)2345×19+23×2645,=2345×19+2345×26,=2345×(19+26),=2345×45,=23;(4)82×...

(1)603-(58+21×7)=603-(58+147)=603-205=398;(2)(27+33)×13-46=60×13-46=780-46=734;(3)(975-300)÷(300÷12)=675÷25=27;(4)45+(55÷5)-20=45+11-20=56-20=36;(5)532+342÷18×52=532+19×52=532+988=1520;(6)5400÷(210...

用脱式计算下面各题。 1、125+25×6 2、(135+75)÷(14×5) 3、120-60÷5×5 4、1024÷16×3 5、(135+415)÷5+16 6、1200-20×720-720÷15 7、(360-144)÷24×3 8、240+480÷30×(6+13) 9、(120×2+120)÷9 10、164-13×5+85 11、330÷(65-50) 12、...

(1)45.55-(6.82+15.55) (2)34.52-17.87-12.23(3)6.43-(1.4-0.57) (4)23.75-8.64-3.46(5)17.83-9.5-7.83-0.5 (6)5.38+88.2-2.38+1.8(7)27.38-5.34+2.62-4.66 (8)21.63-(8.5+9.63) (9)7.5-2.45+7.5+2.45 (10)0.9+0.99+0....

(45-18)+(9-6)=27+3=30, (45-27)+(9-3)=18+6=24, (45-27)+(9-6)=18+3=21 (45-28)+(9-3)=17+6=23, (45-28)+(9-6)=17+3=20, (46-17)+(8-3)=29+5=34 (46-17)+(8-5)=29+3=32, (46-19)+(8-3)=27+5=32, (46-19)+(8-5)=27+3=30 (46-27)+(8-3)=19+5=24, ...

(1)(132+68)×(124-57)=200-67=133;(2)972÷(720-21×33)=972÷(720-693)=972÷27=36;(3)62×45+38×45=(62+38)×45=100×45=4500;(4)336×25-236×25=(336-236)×25=100×25=2500;(5)57×99=57×(100-1)=57×100-57×1=5700-57=5643...

408-12×24 = 408 - 288 = 120 (46+28)×60 = 74 x 60 = 4440 42×50-17 = 2100- 17 = 2083 32+105÷5 = 32 + 21 = 53 420×(327-238) = 420 x 89 = 37380 (4121+2389)÷7 = 6510 ÷7 = 930 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1 0.8×[(10...

4.5*12.8-4.5*1.28 =4.5×(12.8-1.28) =4.5×11.52 =51.84

(1)195-(45+45÷9)=195-(45+5)=195-50=145;(2)43×(324-298)=43×26=1118;(3)(79+21)×(96÷12)=100×8=800;(4)78×(360÷60)÷3=78×6÷3=468÷3=156;(5)(183-94)×(123÷3)=79×41=3239;(6)(72÷3+40)×60=(24+40)×60=64×...

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