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简便方法计算
(8+0.7)×12.5+0.7×37.5
=8.7×12.5+0.7×3×12.5
=8.7×12.5+2.1×12.5
=10.8×12.5
=10×12.5+0.8×12.5
=125+10
=135
(8+0.7)×12.5+0.7×37.5
=8.7×12.5+0.7×3×12.5
=8.7×12.5+2.1×12.5
=10.8×12.5
=10×12.5+0.8×12.5
=125+10
=135
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=8.7×12.5+0.7×3×12.5
=8.7×12.5+2.1×12.5
=（8.7+2.1）×12.5
=10.8×12.5
=10×12.5+0.8×12.5
=125+10
=135
=8.7×12.5+2.1×12.5
=（8.7+2.1）×12.5
=10.8×12.5
=10×12.5+0.8×12.5
=125+10
=135
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(8+0.7)×12.5+0.7×37.5
=8×12.5+0.7×12.5+0.7×37.5
=100+0.7×(12.5+37.5)
=100+0.7×50
=135
=8×12.5+0.7×12.5+0.7×37.5
=100+0.7×(12.5+37.5)
=100+0.7×50
=135
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解：（8+0.7）×12.5+0.7×37.5
=8×12.5+0.7×12.5+0.7×37.5
=8×12.5+0.7×12.5+2.1×12.5
=（8+0.7+2.1）×12.5
=10.8×12.5
=（10+0.8）×12.5
=10×12.5+0.8×12.5
=125+10
=135
=8×12.5+0.7×12.5+0.7×37.5
=8×12.5+0.7×12.5+2.1×12.5
=（8+0.7+2.1）×12.5
=10.8×12.5
=（10+0.8）×12.5
=10×12.5+0.8×12.5
=125+10
=135
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