解:①123.4÷4÷25, =123.4÷(4×25), =123.4÷100, =1.234;②48×25, =12×4×25, =12×(4×25), =12×100, =1200;
③5.8×101, =5.8×(100+1), =5.8×100+5.8, =580+5.8, =585.8;
④1.2×25×4, =1.2×(25×4), =1.2×100, =120;
⑤46×6.8+6.8×54, =6.8×(46+54), =6.8×100, =680;
⑥99×7.9+7.9, =7.9×(99+1), =7.9×100, =790;
⑦101×0.38-0.38, =0.38×(101-1), =0.38×100, =380;點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡便方法計(jì)算.
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