问题 解答题
计算下面各题,能简便计算的要简算
156×l0l-156404×2523×44+23×57-23
99×3825×32×125400×[(270+80)÷7]
165+29947×99+47630÷18÷5
(730-80÷2)÷23525-20×5+2537+125+63+175
149×45-45×491800÷25÷432×(50+4)
答案

(1)156×l0l-156

=156×(l0l-1)

=156×100

=15600

(2)404×25

=(400+4)×25

=400×25+4×25

=10000+100

=10100

(3)23×44+23×57-23

=23×(44+57-1)

=23×100

=2300

(4)99×38

=(100-1)×38

=100×38-38

=3800-38

=3762

(5)25×32×125

=25×4×8×125

=(25×4)×(8×125)

=100×1000

=100000

(6)400×[(270+80)÷7]

=400×[350÷7]

=400×50

=20000

(7)165+299

=165+(300-1)

=465-1

=464

(8)47×99+47

=47×(99+1)

=47×100

=4700

(9)630÷18÷5

=630÷(18×5)

=630÷90

=4

(10)(730-80÷2)÷23

=(730-40)÷23

=690÷23

=30

(11)525-20×5+25

=525-100+25

=(525+25)-100

=550-100

=450

(12)37+125+63+175

=(37+63)+(125+175)

=100+300

=400

(13)149×45-45×49

=(149-49)×45

=100×45

=4500

(14)1800÷25÷4

=1800÷(25×4)

=1800÷100

=18

(15)32×(50+4)

=32×50+4×32

=1600+128

=1728

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