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420÷6-137200÷9÷4300+300×7(48+52)÷5420÷3×420×6÷2.
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(1)420÷6-13, =70-13, =57; (2)7200÷9÷4, =7200÷(9×4), =7200÷36, =200; (3)300+300×7, =300×(1+7), =300×8, =2400; (4)(48+52)÷5, =100÷5, =20; (5)420÷3×4, =140×4, =560; (6)20×6÷2, =120÷2, =60; |
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