脱式计算,能简算的要简算.①480-48+124②1.25×3.2×0.25③(723+13)×3+223④(23-25)×30⑤3.45÷[0.3×(2.3-1.8)]⑥23×[(13-15)÷45].-数学
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答案
(1)480-48+124, =432+124, =556; (2)1.25×3.2×0.25, =(1.25×8)×(0.4×0.25), =10×0.1, =1; (3)(
=
=(
=1+1, =2; (4)(
=
=20-12, =8;
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