脱式计算,能简算的要简算.(1)10.5+0.5÷0.5(2)105×7.3-7.3×4-7.3 (3)29.07-22.78÷3.4(4)4.8×0.25(5)0.8×(12.5-1.25)
(1)10.5+0.5÷0.5, =10.5+1, =11.5; (2)105×7.3-7.3×4-7.3, =(105-4-1)×7.3, =100×7.3, =730; (3)29.07-22.78÷3.4, =29.07-6.7, =22.37; (4)4.8×0.25, =1.2×4×0.25, =1.2×(4×0.25), =1.2×1, =1.2; (5)0.8×(12.5-1.25), =0.8×12.5-0.8×1.25; =10-1, =9. |
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