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脱式计算:(能简算的要简算)7.8÷1.25÷80.67×99+0...

(1)7.8÷1.25÷8=7.8÷(1.25×8)=7.8÷10=0.78(2)0.67×99+0.67=0.67×(99+1)=0.67×100=67(3)3.76×2.9-1.9×3.76=3.76×(2.9-1.9)=3.76×1=3.76(4)2.5×3.2×1.25=(2.5×4)×(0.8×1.25)=10×1=10(5)0.38+9.62÷3.7×5.2=0.38+2.6×5.2=0.38+13...

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...

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...

12×23= 13×26=

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